The secret to the Mermade Blow Dry Brush lies in its unique design. The brush has two different sized barrels that work together to create beautiful, bouncy curls or smooth, sleek straight hair. And because the barrels are interchangeable, you can easily switch between styles without having to change brushes. The Mermade Blow Dry Brush comes with two brush heads - a large barrel for body and volume, and a small barrel for tighter curls and waves. It also includes a PROTip attachment for hard-to-reach areas like the nape of the neck. So no matter what style you're going for, the Mermade Blow Dry Brush has you covered.